Process for rendering worn bushings usable.



'c. P. BEACH. PROCESS FOR RENDERING WORN BUSHINGS USABLE.

APPLICATION FILED APR- 27.1917.

Patented Aug. 20, 1918,

UNITED STATES PATENT OFFICE.

CHARLES IP. BEACH, OF LITTLETON, NEW HAMPSHIRE.

I PROCESS FOR RENDERING WORN BUSHINGS USABLE.

Specification of Letters Patent. Patented Aug. 20, 1918.

Original application filed June 6, 1916, Serial No. 104,056. Divided and this application filed April 27, 1917. Serial No. 164,915.

To all whom z't may concern:

Be it known that I, CHARLES P. BEACH, a citizen of the United States of America, residing in the town of Littleton, in the county of Grafton and State of New Hampshire, have invented an Improvement in Processes for Rendering Worn Bushings Usable, of

which the following is a specification.

This invention relates to a method for rendering usable worn bushings.

The object of the invention is to provide a new and improved method of treating worn bushings whereby the bore of the bushing is reduced to less than the desired diameter to permit of reboring and continued use of the bushing.

With the above and other objects in view the invention consists in the details of construction and in the arrangement and combination of parts to be hereinafter more fully described and particularly pointed out in the appended claims.

In describing the invention in detail reference will be had to the accompanying drawings wherein like characters of reference denote corresponding parts in the several views, and in which- Figure 1 is a side elevation of an illustrative apparatus which may be utilized to compressed, and

advantage in carrying out the herein described invention, said apparatus being shown partly in section.

Fig. 2, a front view of the apparatus;

Fig. 3, a longitudinal section through the worn bushing of a connecting rod with the compression pins in position ready to be inserted previous to operatingon the bushing through the medium of the improved apparatus;

Fig. 4,-a view similar to Fig. 3 showing the status of the bushinglwith respect to the compression pins after t e bushing has been Fig. 5, a view similar to Fig.4 disclosing a square bushing and square compression pins. v

Referrin to the drawings the apparatus b which t e invention may be practised is sliown as comprising a base 10 from which rises a standard 11. The upper end of this standard terminates in a forwardly disposed ofisetportion 12 having a vertical passage 13 therein, the upper end of said passage terminating in a reduced portion 14 in which is .slidably engaged the head 15 of a screw a lever 21. Rising from the base 10 is a column 22 the lower portion of which abuts the standard 11 while the upper portion is connected to the standard and the offset portion 12 by a web 23. This column 22 is rovided with a recess 24 opening through t e upper end thereof and in which recess is slidably engaged a rack 25 the upper end of which cooperates with the adjacent end of the lever 21. Rotatably mounted in a suitable bearing 26 carried by the column 22 and web 23 is a shaft 27 on which is fixed a pinion 28 cooperating with the rack 25. The shaft -27 is provided with a transverse passage 29 in .which is slidably engaged a handle 30 whereby the shaft 27 may be manually rotated to raise the rack 25. The. ressing lever 21 is connected to the screw ead 15 by a link 31. This pressing lever 21 is normally heldin engagement with the upper end of the rack 25 by means of a spring 32 one end of which is secured to an extension 33 of said lever, while the other end thereof is anchored to an ear 34 formed on the column 22.

I In Fig. 1 the apparatus is shown in the act of compressing the bushing of a connecting rod of an explosive engine, such connecting rod being indicated at 35 and the bushing at 36. Before compressing the bushing 36 to permit reboring of same to the desired diameter there is inserted in each end of the'bushin a compressing pin 37 of a diameter slight y less than the desired diameter of the bore of the bushing. Each compressing pin 37 is provided with a flange. 38 at its outer end which rests upon the adjacent end of the bushing. When these pins 37 have been inserted in the bushing as shown in Fig. 1 with the outer end. of the pins engaged by the nut 17 and the anvil 19 respectively the handle 30 is pushed down to rotate the shaft 27 and this shaft acting through the pinion28 will raise the rack 25 and lift the adjacent end of the lever 21 with great power. This movement of the lever .is transmitted through its opposite end and through the link 31 to force the screw 16 and nut 17 downwardly to effect the desired compression of the bushing 36. By reference to Fig. 4 it will be seen that this compression of the bushing will cause the metal thereof to flow so that the end portions of the bore of the bushing will conform in di: ameter to the diameters of the compressing pins and as the diameters of these pins invention into practice has been illustrated conform its outside diameter to that of the die and to conform its inside diameter to and described it will be obvious that various changes may be resorted to without departing from the scope of the invention as set forth in the appended claims; this application being a divisional of my earlier and copending application filed June 6, 1916, 'Serial No. 104,056.

I claim as my invention:

1. The herein described method of refinishing the bore of worn bushings consisting of placing a rigid filler in the bore of the bushing of less diameter than the desired diameter of the bushing, then compressing the bushing longitudinally until its bore conforms in diameter to the diameter of the filler, and then reboring the bushing to a desired diameter.

2. The improvement in the art of fitting bushings which consists in placing the bushing in a die having a bore of a diameter desired for theexterior of the bushing, placing within the bushing a filler of less diameter than the inside diameter of the bushing, compressing the bushing longitudinally to that of the filler.

3. The imp rovement in the art of fitting bushings which consists in placing the bushing in a die having a bore of a diameter desired for the exterior of the bushing, placing within the bushing a filler of less diameten than the inside diameter of the bushing, compressing the bushing longitudinally to conform its outside diameter to that of the die and to conform its inside diameter to that of the filler, and thereafter boring the bushing to a desired diameter.

4. The improvement in the art of refitting worn bushings which consists in placing within the bushing a filler of less diameter than the diameter of the bushing, and compressing the bushing longitudinally to reduce its bore while restraining the bushing from transverse external expansion by the bearing to be bushed.

5. The improvement in the art of refittingworn bushings which consists in lacing within the bushing a filler of less diameter than the diameter of the bushing, compressing the bushing longitudinally to reduce its bore while restraining the bushing from transverse external expansion by the bearing to be bushed, and reboring the bushing to a desired diameter. p

6. The improvement in the art of refitting worn bushings which consists in reducing the internal bore of a bushing by longitudinal pressure while restraining the bushing from transverse external expansion by the bearing to be bushed.

7. The improvement in the art of refitting Worn bushings which consists in reducing the internal bore of a bushing by longitudinal pressure While restraining the bushing from transverse external expansion by the bearing to be bushed, and thereafter reboring the bushing to a desired diameter.

8. The improvement in the art of refitting worn bushings which consists in placing in each end of the bushing a headed filler the diameter of the headed portions approximating the diameter of a bearing surrounding said bushing and the diameter of the filler portions being less than the diameter of the bushing, applying pressure to the fillers longitudinally ofthe bushing thereby reducing the internal bore of the bushing while maintaining its external diameter substantially constant.

9. The improvement in the art of refitting worn bushings which consists in placing in each end of the bushing a headed filler the diameter of the headed portions approxi mating the diameter of the bearing and the diameter of the filler portions being less than the diameter of'the bushing, appl ing pressure to the fillers longitudinally o the I bushing thereby reducing the internal bore of the bushing while maintaining its external diameter substantially constant, and thereafter reboring the bushing to a desired diameter.

In testimony whereof, I have signed my name to this specification this 25th day of April,1917.

CHARLES P. BEACH. 

